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Technical Data Sheet
91780A346 ✓ Verified by PartsTable
· ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The STANDOFF,THREADED,SPACING is a the manufacturer industrial component. Key specifications include length: 0.745 INCHES MINIMUM AND 0.755 INCHES MAXIMUM IN, material: ALUMINUM ALLOY 2011 OVERALL, thread_class: 2B FLANGE HOLE, thread_length: 0.750 INCHES NOMINAL FLANGE HOLE IN, style_designator: INTERNALLY THREADED FULL LENGTH, thread_direction: RIGHT-HAND FLANGE HOLE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-649-3965, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
91780A346
NSN: 5340-01-649-3965
FSC: 5340
CAGE: 3A054 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
length0.745 INCHES MINIMUM AND 0.755 INCHES MAXIMUM IN
materialALUMINUM ALLOY 2011 OVERALL
thread_class2B FLANGE HOLE
thread_length0.750 INCHES NOMINAL FLANGE HOLE IN
special_featuresHEX SIZE TOLERANCE: MINUS 0.006 INCH TO 0.006 INCH;TENSILE STRENGTH: 45000 PSI;HARDNESS, ROCKWELL: B50;ALUMINUM IS LIGHTWEIGHT AND HAS MILD CORRISION RESISTANCE IN
style_designatorINTERNALLY THREADED FULL LENGTH
thread_directionRIGHT-HAND FLANGE HOLE
width_across_flats0.500 INCHES NOMINAL IN
nominal_thread_size0.190 INCHES FLANGE HOLE IN
cross-sectional_shapeHEXAGON
end_item_identification6115-01-591-1161;GENERATOR,HEATING AND AIR CONDITIONER
thread_quantity_per_inch32 FLANGE HOLE
NSN5340-01-649-3965
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 91780A346 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
NOMINAL THREAD SIZE: 0.190 INCHES FLANGE HOLE IN
LENGTH: 0.745 INCHES MINIMUM AND 0.755 INCHES MAXIMUM IN
THREAD SERIES DESIGNATOR: UNF FLANGE HOLE
STYLE DESIGNATOR: INTERNALLY THREADED FULL LENGTH
WIDTH ACROSS FLATS: 0.500 INCHES NOMINAL IN
THREAD DIRECTION: RIGHT-HAND FLANGE HOLE
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESHEX SIZE TOLERANCE: MINUS 0.006 INCH TO 0.006 INCH;TENSILE STRENGTH: 45000 PSI;HARDNESS, ROCKWELL: B50;ALUMINUM IS LIGHTWEIGHT AND HAS MILD CORRISION RESISTANCE IN
NOMINAL THREAD SIZE0.190 INCHES FLANGE HOLE IN
LENGTH0.745 INCHES MINIMUM AND 0.755 INCHES MAXIMUM IN
THREAD SERIES DESIGNATORUNF FLANGE HOLE
STYLE DESIGNATORINTERNALLY THREADED FULL LENGTH
WIDTH ACROSS FLATS0.500 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND FLANGE HOLE
END ITEM IDENTIFICATION6115-01-591-1161;GENERATOR,HEATING AND AIR CONDITIONER
THREAD QUANTITY PER INCH32 FLANGE HOLE
THREAD CLASS2B FLANGE HOLE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
6225-7Interchangeable
interchangeable cross-reference
interchangeable
L218732-1Interchangeable
interchangeable cross-reference
interchangeable
63078Interchangeable
interchangeable cross-reference
interchangeable
63078-280Interchangeable
interchangeable cross-reference
interchangeable
379181R1Interchangeable
interchangeable cross-reference
interchangeable
D73925Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 91780A346?
91780A346 is a STANDOFF,THREADED,SPACING.
What parts can replace 91780A346?
There are 10 known substitutes for 91780A346: 6225-7, L218732-1, 63078 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 91780A346?
91780A346 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-649-3965. This indicates validated use in U.S. government and defense supply chains.
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